/* SPDX-License-Identifier: MIT
 *
 * Copyright (c) 2025, eunomia-bpf org
 * All rights reserved.
 */
#define BPF_NO_GLOBAL_DATA
#include <vmlinux.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>

SEC("kprobe/__memcapture")
int do_hipmem_capture(struct pt_regs *ctx)
{
    // HIP memory capture implementation
    // This probe can be attached to HIP memory allocation/deallocation functions
    // such as hipMalloc, hipFree, hipMemcpy, etc.
    
    // Get the current process ID and thread ID
    u64 pid_tgid = bpf_get_current_pid_tgid();
    u32 pid = pid_tgid >> 32;
    u32 tid = pid_tgid;
    
    // Log the memory operation
    bpf_printk("HIP memory operation detected: PID=%d, TID=%d\n", pid, tid);
    
    // For demonstration, we can inject errors randomly
    // int rand = bpf_get_prandom_u32();
    // if (rand % 100 == 0) {  // 1% chance of error injection
    //     bpf_printk("bpf: Injecting error into HIP memory operation\n");
    //     bpf_override_return(ctx, -1);
    //     return 0;
    // }
    
    bpf_printk("bpf: HIP memory operation continues normally\n");
    return 0;
}

// Probe for HIP kernel launches
SEC("uprobe/hipLaunchKernel")
int trace_hip_kernel_launch(struct pt_regs *ctx)
{
    u64 pid_tgid = bpf_get_current_pid_tgid();
    u32 pid = pid_tgid >> 32;
    
    bpf_printk("HIP kernel launch detected: PID=%d\n", pid);
    
    // Could capture kernel parameters, grid dimensions, etc.
    // void *kernel_func = (void *)PT_REGS_PARM1(ctx);
    // bpf_printk("Kernel function pointer: %p\n", kernel_func);
    
    return 0;
}

// Probe for HIP memory allocations
SEC("uprobe/hipMalloc")
int trace_hip_malloc(struct pt_regs *ctx)
{
    u64 pid_tgid = bpf_get_current_pid_tgid();
    u32 pid = pid_tgid >> 32;
    
    // size_t size = (size_t)PT_REGS_PARM2(ctx);
    bpf_printk("HIP malloc detected: PID=%d\n", pid);
    
    return 0;
}

// Probe for HIP memory deallocations
SEC("uprobe/hipFree")
int trace_hip_free(struct pt_regs *ctx)
{
    u64 pid_tgid = bpf_get_current_pid_tgid();
    u32 pid = pid_tgid >> 32;
    
    // void *ptr = (void *)PT_REGS_PARM1(ctx);
    bpf_printk("HIP free detected: PID=%d\n", pid);
    
    return 0;
}

char LICENSE[] SEC("license") = "GPL";